Magnesia cement.



-. UNITED STATES .4 ,ERNsr BIDTEL,-OF HoBo EN; .NEW JERSEY, ASSIGNOR, BY'DIREOT AND PArE vroE IoE.

MESNEASSIGNMENTS, To AMERICAN I'IYDROLITUCOM PANY,,-OF

HOBOKEN, NEW JERSEY,1 A CORPORATION or NEW JERSEY.

'MAGVNESIIA CEMENT..-

' i no. 827,286. a

To all whont it vmzy' concern:

. Be it known thatI, ERNST BIDT L, a citizen of the United States, residing at Hoboken, in thecounty of Hudson and State of New Jer-.

- .5 sey, have invented certain new and useful Im provem'ents in Magnesia Cement; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others ski'lledin the art to'which it. appertains to make and use the sarne. My invention has for its object to provider a magnesia-cement composition which while "retaining all of the advantages f this prodnot as it is now" manufactured will overcome the difficulties and disadvantages attending the shipment and-use of this product at points distant from the place of manufacture and which will, furthermore, improve the product; and it consists in the combination of constituents and the method of compounding same, hereinafter fully described and claimed.

Magnesia cement as it isnOW'made consists ofa dry powder composition: of burnt, magnesite and aliquid agent consisting of chlorid of magnesium, which is added to the 1 dry powder compound, and any suitable filler at-the point Where. such cement is to be used and causes the mass to set'a'nd become gohard. f

The difliculty and expense incurred in shipping thediquidis. a serious obstacle to the more general use of this material, which is superior to other cement'by reason of the fact that it is very light, substantially waterproof and fireproof, and exceedingly durable and capable ofbeing well finished, and hence very neat in appearance; I

My present nvention consists in mixing a concentrated solution of chlorid-of-ma nel sium ,withsawdust or other suitable filer, preferably of a porous nature, which will absorb the solution. -Suchfill er remains very moist and is consequently diflicult to handle in certain respects, as, if handled, the hands jwill .be moistened and the'eflect is very disagreeable. To overcome-this diflioulty, I, add tofthe ,thus moistened filler pulverized infusorial earth or fossil-flour, which forms a coating over the'particles of filler and takes up surplus moisture and renders the mixture dry and veg easy to handle. The thusmoistened Specification of Letters Patent. Application filed November 11 1904i serial lie. 232.359.

ler may "obviously be easily.

racemes July 3. 1,'1e oe.

shipped without danger of loss by leakage, I &c., and at much less expense than the liq? .uid.

' At the point where suchfcen'ient is to be" used there isadded' to ,the. above mixture finely-pulverized burnt'magnesite and water, whi,ch effects the chemical rea'ctionnee 6o.

hard.

The'proportionsof the various ingredients are substantially "as follows to produce-the i best results where sawdust is employed as a 6'5 filler: sawdust, thirty-six parts, by'weight; magnesium chlorid solution, (368 Baum), eighty-five; parts; infusorial, earthf. twentyfive parts. To the above m'ixtureis added at'the point Where the composition is to be used one hundred'p'arts, by weight, of pul- -verized burnt magnesite and forty-threefand onehalf parts, by.weight', ofwater. Of course the proportions of sawdust and infusorial earth maybe varied, forinstance, bytaking more sawdust and less infusoria'l earth It is however, not advisable'to use more than sixty parts of sawdust and less than twelve parts of infusorial earth As the formula-above given makes, a very {inelastic stone, be'st' suitable for fioor tilings, it is not advisable to use any i less proportions ofsawdust or greater proportions-of infusoiia-l earth than'those/ given 1 in the formula, asfthe stone will then become too .inelasticffor practical purposes. For

larger surfaces, which areto be covered with a continuous flooring and not by tiles, it i 1- ,lgf advisable to use a greater proportion of saw rl' dust and a less proportion of infusorial earth,- but not substantially exceedin tion will be .too soft and will not wear well.

{The exact proportions best suitable for'the particular fioor to 'be'laid must be determined in each instance byclimatic conditions, 5; I average temperature, and conditions of use. I therefore do not desire to be limitedto the i In the formula above given the eighty-five parts of magnesium-'chlorid solution, 1 of the strength indicated, combines chemically withiabout seventy-five parts of pulverized burnt magnesite The proportions neethe limits 9 above set forth, asotherwise' t e composiessary for a complete chemical combination of the magnesium chlorid should always be present; but pulverized burnt magnesite may be added in excess, in which case it acts as a filler. .In the formula above given twenty-five of the one hundred parts of pulverized burnt magnesite are added as filler.

:The infusorial earth. is also a valuable addition by reason of the fact that it contains "silicic acid, which probably combines with the magnesium oxid to form silicate of mag- "nesiuin, which is effective in rendering the composition harder, more elastic, more durable,an d renders its resistance to water and atmospheric influences far greater.

Suitable coloring-mattersuch as dropblack, ocher, umber, red oxid, &c.may be added as desired without affecting the com-' position.

20' I claim as my invention l 1 The combination of substantially thirtyname in presence of two subscribing witnesses.

E INST BIDTEL.

Witnesses:

RUDOLPH WM. LoTz, F. SOIILOTFELD.

substantially of 

